EP0107568B1 - Dispositif d'examen d'échantillons par émission électronique - Google Patents

Dispositif d'examen d'échantillons par émission électronique Download PDF

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Publication number
EP0107568B1
EP0107568B1 EP83401971A EP83401971A EP0107568B1 EP 0107568 B1 EP0107568 B1 EP 0107568B1 EP 83401971 A EP83401971 A EP 83401971A EP 83401971 A EP83401971 A EP 83401971A EP 0107568 B1 EP0107568 B1 EP 0107568B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
cathode
sample
anodes
samples
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83401971A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0107568A2 (fr
EP0107568A3 (en
Inventor
Georges Comby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0107568A2 publication Critical patent/EP0107568A2/fr
Publication of EP0107568A3 publication Critical patent/EP0107568A3/fr
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Publication of EP0107568B1 publication Critical patent/EP0107568B1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
    • G01N23/227—Measuring photoelectric effect, e.g. photoelectron emission microscopy [PEEM]

Definitions

  • the present invention relates to the examination of samples capable of emitting electrons, in particular as a result of stimulation, caused by a particular thermal or photonic excitation, with a view to detecting and locating these electrons.
  • a first application of this kind of examination implements certain sample materials which emit, during thermal stimulation, a flow of electrons which can be used to measure the intensity of a specific excitation previously undergone by the sample. .
  • sample materials are deferred time converters of the phenomena that we want to observe.
  • this first application relates to the examination of converter materials used in particular as radiation dosimeters used for the protection of personnel exercising their activity in areas liable to be irradiated.
  • thermostimulated electrons have been detected and located either using electron multiplier devices requiring a good quality vacuum (channel trons and microchannel wafers), or by integration in an ionization chamber, or by the use of electronically multiplying meters in gases.
  • electron multiplier devices requiring a good quality vacuum (channel trons and microchannel wafers), or by integration in an ionization chamber, or by the use of electronically multiplying meters in gases.
  • These different detection methods all use precise apparatuses, very neat, delicate and therefore expensive to manufacture. In addition, they do not make it possible to analyze samples of large area, nor to simply detect separately the exo-electrons emitted by several specialized zones of the converter material.
  • a second application of this kind of examination concerns the location of surface defects.
  • the object of the present invention is to propose a device for examining samples by electronic emission, in particular stimulated, which is simple, does not involve operation under vacuum, or is robust, can conveniently examine samples whatever their dimensions, allows a separate analysis of different areas of the sample and constitutes a device usable in an industrial environment and not only in the laboratory.
  • the invention consists in applying in a new way part of a previously known "radiation detection and localization device", which was the subject of European patent application EP-A-7842 in the name of same applicant.
  • This prior patent relates to a device for detecting and locating radiation comprising in a sealed enclosure a cathode, a plurality of filiform anodes isolated from each other and polarized with respect to the cathode, and photosensitive means, this sealed enclosure being provided a porthole transparent to the radiation concerned situated opposite the cathode and the anodes, characterized in that it comprises an insulating support having two faces and of which a part of one face, situated opposite the porthole, is coated of a conductive material forming a network of meshes constituting the cathode, the ends of the anodes having the shape of a point and the axes of the anodes coinciding respectively with the axes of the meshes of the network, these points being located in withdrawal with respect to the face of the insulating support which is coated with the network of conductive meshes.
  • this detector device is made up of a matrix of independent cells, although there is no such thing. physical isolation of these cells. This results from the shape of the matrix cathode and from the position of the spike-shaped anodes below this matrix, the insulating support allowing this level. material optical isolation between the multiplier zones of the tips and between these zones and the cathode.
  • the appropriate control of the potentials applied to the different components of the detector makes it possible to create electric field lines allowing this functional independence of the cells.
  • the existence of an equipotential conductive frame in front of the window imposes a precise configuration of the field lines; therefore, it constitutes a drift space and moreover, ensures the neutralization of the positive charges created during multiplication.
  • the invention consists in taking advantage of these characteristics and performances of a multi-point detector with cathodic focusing to make it a device for examining samples by stimulated electronic emission.
  • the subject of the invention is therefore a device for examining samples by electronic emission, characterized in that it comprises in an enclosure an insulating support, part of one face of which is coated with a conductive material. forming a network of meshes constituting a cathode, a plurality of anodes isolated from each other and polarized with respect to the cathode having the form of points whose axes respectively coincide with the axes of the meshes of the cathode network, these points being located in withdrawal by relative to the face of the insulating support which is coated with the network of conductive meshes, said enclosure having an opening disposed beyond the anodes relative to the matrix cathode, this opening serving as a housing for the samples to be examined, the device further comprising means for sealing the interior of the enclosure, means for filling this sealed interior of the enclosure with a gaseous multiplier medium and means for ap apply an excitation to the sample.
  • the idea of the invention was to note that the arrangement of an electro-emissive conductive sample, in place of the porthole lined with a conductive frame, made it possible to drain all the electrons appearing on the surface of the sample.
  • the device for examining samples is characterized in that said means for exciting the sample are means for thermal excitation.
  • the device for examining samples is characterized in that said means for exciting the sample are means for photon excitation.
  • means are provided for filling the sealed interior of the enclosure with methane under atmospheric pressure.
  • the device for examining samples includes means for making and controlling relative displacements of the device relative to the sample.
  • the sample occupying the housing seals the interior of the enclosure.
  • thermoexcitable samples in order to emit electrons.
  • the device comprises inside a chamber 1, a cathode formed by an insulating support 2, part of the face 3 of which is coated with a layer 4 of a conductive material forming a network of meshes constituting the cathode.
  • a plurality of anodes 5 isolated from each other have the shape of points whose axes respectively coincide with the axes of the meshes of the cathode network 4. These pointed anodes 5 are located in withdrawal with respect to the cathode network 4.
  • the enclosure has an opening 6 on its face beyond the anodes 5 relative to the cathode 4.
  • this opening 6 is housed the heat-excitable sample 7, worn precisely on a thermal stimulation element 8.
  • the inside the enclosure 1 is sealed when the sample is in the examination position, as shown in FIG. 1.
  • a source 9 of multiplier gas for example methane under atmospheric pressure is provided to fill the sealed interior of enclosure 1. It will be noted that if a sample formed of juxtaposed zones of sensitivities is placed in this examination device different to irradiation, the signs representative of the excitations undergone by these different zones may be taken from groups of different anodes corresponding to these different zones.
  • FIG. 2 schematically represents a device for examining photo-excitable samples in order to emit electrons.
  • the sample consists of a surface 10 to be explored.
  • An optical light source 11 makes it possible to excite this surface.
  • a sealing member 12 is provided between the base of the enclosure 1 and the surface 10.
  • a device 13 makes it possible to identify the relative position of the mobile examination device relative to the surface to be explored.
  • FIGS. 1 and 2 We have identified, in FIGS. 1 and 2, the electron drift space 14 mentioned above, as well as the zones 15 of electronic multiplication in gaseous medium.
  • an auxiliary electrode similar to the electron 13 of the aforementioned patent is useful on the face of the insulating support opposite to that carrying the cathode.
  • the sample occupies the location of the observation window of the radiation detection and localization device of the aforementioned patent application; its surface is therefore necessarily conductive, in order to constitute an equipotential comparable to the conductive frame described in this patent.
  • the sample is insulating, it is essential to implement a known technique, capable of creating this equipotential; for example, a sample in divided form can be mixed with a conductive material; a conductive frame can be deposited on the sample, etc.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
EP83401971A 1982-10-19 1983-10-10 Dispositif d'examen d'échantillons par émission électronique Expired EP0107568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8217472A FR2534688A1 (fr) 1982-10-19 1982-10-19 Dispositif d'examen d'echantillons par emission electronique
FR8217472 1982-10-19

Publications (3)

Publication Number Publication Date
EP0107568A2 EP0107568A2 (fr) 1984-05-02
EP0107568A3 EP0107568A3 (en) 1985-01-23
EP0107568B1 true EP0107568B1 (fr) 1987-09-02

Family

ID=9278386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401971A Expired EP0107568B1 (fr) 1982-10-19 1983-10-10 Dispositif d'examen d'échantillons par émission électronique

Country Status (4)

Country Link
US (1) US4654556A (enrdf_load_stackoverflow)
EP (1) EP0107568B1 (enrdf_load_stackoverflow)
DE (1) DE3373350D1 (enrdf_load_stackoverflow)
FR (1) FR2534688A1 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590376A (en) * 1984-05-30 1986-05-20 Photo Acoustic Technology, Inc. Apparatus and technique for monitoring photoelectron emission from surfaces
RU2210139C2 (ru) * 2001-04-27 2003-08-10 Оренбургский государственный университет Беспроволочный микроточечный рентгеновский детектор
US7586888B2 (en) * 2005-02-17 2009-09-08 Mobitrum Corporation Method and system for mesh network embedded devices
US7630736B2 (en) * 2005-10-11 2009-12-08 Mobitrum Corporation Method and system for spatial data input, manipulation and distribution via an adaptive wireless transceiver
US7801058B2 (en) * 2006-07-27 2010-09-21 Mobitrum Corporation Method and system for dynamic information exchange on mesh network devices
USRE47894E1 (en) 2006-07-27 2020-03-03 Iii Holdings 2, Llc Method and system for dynamic information exchange on location aware mesh network devices
US8427979B1 (en) 2006-07-27 2013-04-23 Mobitrum Corporation Method and system for dynamic information exchange on location aware mesh network devices
US8411590B2 (en) 2006-07-27 2013-04-02 Mobitrum Corporation Mesh network remote control device
US8305935B2 (en) * 2006-07-27 2012-11-06 Mobitrum Corporation Method and system for dynamic information exchange on location aware mesh network devices
US8305936B2 (en) 2006-07-27 2012-11-06 Mobitrum Corporation Method and system for dynamic information exchange on a mesh network in a vehicle
US20090189739A1 (en) * 2008-01-25 2009-07-30 Mobitrum Corporation Passive voice enabled rfid devices
US8829886B2 (en) 2011-12-14 2014-09-09 General Electric Company Systems and methods for defect detection using exoelectrons

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692948A (en) * 1948-12-29 1954-10-26 Kurt S Lion Radiation responsive circuits
US3852595A (en) * 1972-09-21 1974-12-03 Stanford Research Inst Multipoint field ionization source
US4033904A (en) * 1974-03-22 1977-07-05 Varian Associates, Inc. Interchangeable specimen trays and apparatus for a vacuum type testing system
FR2431185A1 (fr) * 1978-07-12 1980-02-08 Commissariat Energie Atomique Dispositif de detection et de localisation de rayonnements
WO1982002624A1 (en) * 1981-01-16 1982-08-05 Turner David Warren Emission-electron microscope

Also Published As

Publication number Publication date
EP0107568A2 (fr) 1984-05-02
DE3373350D1 (en) 1987-10-08
FR2534688A1 (fr) 1984-04-20
EP0107568A3 (en) 1985-01-23
FR2534688B1 (enrdf_load_stackoverflow) 1985-05-17
US4654556A (en) 1987-03-31

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